Door-check



S.v FRISBIB.

DOOR GHB-GK (No Model.)

No. 530,101. Patented Dec. 4, 1894.,

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NITE c STATES ATENT I FFICE.

SAMUEL FRISBIE, OF UNIONVILLE, CONNECTICUT.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 530,101, dated December 4, 1894.

Application kfiled December 27, 1893. Serial No. l195,022. (No motlel To @ZZ whom it may con/cern:

Be it known that I, SAMUEL FRISBIE, a citi- Zen of the United States, residing at Unionville, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Door-Checks, of which the following is a specification.

My invention relates to improvements in door checks of the piston and cylinder class, and the objects of my improvement are simplicity of construction and general efliciency in operation, especially with reference to properly guiding the piston rodat one end of the cylinder. l

In the accompanying drawings: Figure 1 is a front elevation of my door check partly in section ontheline ma: of Fig. 4. Fig. 2 is a plan view of the same alsopartly in section on the line yy of Fig. 4. Fig. 3 is an elevation show-V ing the left hand end of my door check, and Fig. 4 is an elevation showing the right hand end of the cylinder.

A designates a cylinder mounted upon bracket heads B and C by means of which the cylinder is secured in place. The bracket head C may be provided with an air valve 5 and a vent screw 6 of any ordinary construction. Within the cylinder is the ordinary piston 7 connected withthe piston rod 8 which projects through the center of the bracket head B and extends to some distance therefrom where it enters and is supported by the third bracket D in alignment with the `cyl inder. I have shown this bracket D as of a separate casting from the bracket head B, but if desired it might be made in one piece therewith by simply extending the plate or feet portion as indicated by broken lines at 9 in Fig. 2. The bracket D in addition to furnishing a guide for the outer end of the piston rod is provided with lugs 10 to which the toggle frame 11 is pivoted by means of the pin 12. A block 13 is rigidly fixed upon the piston rod in any proper manner, for example by means of the pin 14, and to this block I pivot another toggle frame 15, the inner ends of bothtoggle frames being pivoted together on the pin 16 and connected with the spring 17 so "that said spring has a constant tendency to force thesetoggle frames apart. A pair of toggle frames and spring of themselves are not of my invention, as the same are shown and described in Patent No. 136,371, dated March 4, 1873. I connect an operating lever 18 with this toggle frame by securing it to both of the pins16 and 12, whereby said leverv is connected with said frame, the same in effect as if it were cast in one and the same piece with the frame 11.

E designates a bracket post which is designed to be secured upon a door, and the line 19 in Fig. 1 indicates the top of thedoor, the hinge of the door in this particular arrangement being on the left of said bracket post. A link 20 connects this bracket post with l[he operating lever 18.

Upon opening the door the lever 18 is forced away from the cylinder, turning on the pin 12, thereby pulling the piston and piston rod outwardly and drawing the toggle frames 11 and 15 toward each other, changing their position from ythat shown in full lines to the position indicated for said block 13 and outer ends of said arms by broken lines in Fig. 2, thereby compressing the spring of the toggle frame. Upon releasing the door, the spring returns the parts, and the door to their normal position, the piston and cylinder, together with the valve and vent, operating as in prior door checks of this class.

While I have illustrated the piston and cylinder as especially adapted for au air check, it is evident that the same parts may be changed toa liquid check by merely making such change in the piston andvvalves as the state of the art discloses, for such uses.

I claim as my invention#- The combination of the stationary cylinder and its bracket heads with the third bracket having a perforation in axial alignment with said cylinder, the pistou, the piston rod eX- tending through one of the cylinder heads and through the perforation in said third bracket by which it is guided, the toggle frames and their spring, said frames being pivoted respectively to the third bracket and to the block of the piston rod between said bracket and piston head, and operating mechanism, substantially as described and for the purpose specified.

SAMUEL FRISBIE.

Witnesses:

N. E. DAY, W. E. GRAHAM. 

